Background: playing 8 ball with my family and we usually wager a couple bucks on each game. I'm down to the final ball the 8 ball when the following occurs:

I make the 8 ball however the cue ball somehow manages to strike the 8 ball twice I did not call this however I did call the pocket and it did go in that pocket. I argued to no end but in the end everyone ruled against me. Also what if I called bank and the ball banked more than one before going into said pocket. Thanks for the help

Yeah in real call-shot pool if the designated ball goes in the designated pocket then it's a good shot, regardless of how it gets there. It could hit another ball, two cushions, and the ceiling fan and still be good. However a lot of bars (and homes) can have their own 'house rules' and when they do those are what you have to play by.